अम् सम्बुद्धौ

Operational rule vidhi

The words चतुर् and अनडुह् get an अमागम when followed by सुँ प्रत्यय of सम्बोधन-एकवचन.

Word by word (padaccheda)

Substitute / term अम् prathamā · ekavacanaRight context सम्बुद्धौ saptamī · ekavacana

Substitute / term Prathamā (1st case): in operational rules, the substitute or the thing introduced; in definitions, the term or its referent.
Right context Saptamī (7th case): "when X follows", the operation applies to what precedes (1.1.66 तस्मिन्निति निर्दिष्टे पूर्वस्य). Also a condition or domain ("in the sense of").

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Full reading

अम् सम्बुद्धौ

Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.

Commentary

चतुर् and अनडुह् get the augment अ after the उ in the Vocative Case singular.
This debars the previous rule, as हे प्रियचत्वः (a Bahuvrihi), हे प्रियनड्वन् ॥

Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.